Gerten from Germany to USA 1857

Dear researchers, I do live in Germany. A teacher in Trier is searching for his ggggfather Hubert Gerten. This man was a widdower when he emigrated with his family. He was born 05/05/1797. Mr. Gerten got permission to emigrate on 04/18/1857 and went by ship to USA in May or June 1857. He went with several children (some were married) to the New World. One son was Friedrich (=Frederic or Fred) Gerten (born 04/12/1836).